Common Rail Fuel Injection Pressure Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing internal combustion engines, including rotary engines, have suboptimal combustion arrangements and characteristics due to complex configurations required for main and pilot fuel injections, which are not efficiently optimized for combustion efficiency.
Innovation Solution
The design incorporates a pilot subchamber with a pilot fuel injector and an ignition element, along with a main fuel injector spaced apart, both in communication with a common rail and regulated by a pressure mechanism, allowing for separate and optimized fuel injection pressures to enhance combustion efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a common rail feeds both main and pilot fuel injectors with a single pressure regulating mechanism, then device complexity is reduced, but fuel injection pressure control precision deteriorates
Solution Approach 1:
The patent divides the fuel supply system into two separate common rails: a first common rail for the main fuel injector and a second common rail for the pilot fuel injector. This segmentation allows each rail to have its own pressure regulating mechanism, enabling independent and precise pressure control for main and pilot injections while maintaining manageable system complexity through modular architecture.
Solution Approach 2:
The patent introduces a fuel distribution manifold as an intermediary component that receives fuel from the pump assembly and distributes it to both common rails. This intermediary structure facilitates efficient fuel distribution while allowing independent pressure regulation in each rail, resolving the contradiction between system simplicity and pressure control precision.
2Measurement precision
If separate common rails with different pressure regulating mechanisms are used for main and pilot fuel injectors, then fuel injection pressure control precision is improved, but device complexity increases
Solution Approach 1:
The patent merges the first and second common rails into a single integrated common rail structure that contains separate fuel passages for main and pilot injections. This consolidation reduces the number of separate components while maintaining independent pressure regulation capabilities, thereby improving pressure control precision without proportionally increasing system complexity.
Solution Approach 2:
The patent designs a universal pressure regulating mechanism that can independently control pressure for both main and pilot fuel injections through a single device. This multi-functional approach allows one pressure regulating mechanism to perform the work of two separate mechanisms, reducing device complexity while maintaining precise pressure control for both injection types.
3Device complexity
If a single pressure regulating mechanism controls fuel pressure for both main and pilot injectors, then device complexity is reduced, but combustion efficiency deteriorates due to inability to optimize pressures independently
Solution Approach 1:
The patent implements dynamic pressure regulation by providing independent pressure controlling mechanisms for the main and pilot fuel injectors. This allows the system to dynamically adjust pressure levels independently for each injector based on combustion requirements, optimizing combustion efficiency while maintaining manageable system complexity through coordinated control.
Solution Approach 2:
The patent enables independent variation of fuel injection pressure parameters for main and pilot injections by providing separate pressure regulation capabilities. This parameter independence allows optimization of combustion efficiency through tailored pressure settings for each injection event, while the overall system complexity remains controlled through shared common rail infrastructure.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration improves combustion efficiency by allowing for precise control of fuel injection pressures and volumes, optimizing the combustion process in internal combustion engines.
Implementation Method 1
a common rail in fluid communication with the main fuel injector and with the pilot fuel injector; and a pressure regulating mechanism in fluid communication with the common rail for regulating a fuel pressure therein
Implementation Method 2
a pilot fuel injector having a tip in communication with the pilot subchamber
Implementation Method 3
a main fuel injector spaced apart from the pilot fuel injector and having a tip in communication with the internal cavity at a location spaced apart from the pilot subchamber
Implementation Method 4
an ignition element positioned to ignite fuel within the pilot subchamber
Data Source
AI summary
An internal combustion engine includes first and second common rails each having a metering or pressure regulating valve, with the valves settable at different pressure values from one another. Rotors are each sealingly and rotationally received within a respective cavity to define at least one combustion chamber of variable volume. The engine includes first and second fuel injectors for each of the rotors. Each first fuel injector is in fluid communication with the first common rail and each second fuel injector is in fluid communication with the second common rail. A method of feeding fuel in an internal combustion engine is also provided.